Operation System for Hydraulic Excavator for Deep Trench Works

Results of the experimental analysis of the operation system of a hydraulic excavator for deep trench works are described in this paper. The system of the operation of a hydraulic excavator has a hierarchical structure. The system is a sequentially controlled system which is consists of several partial systems in rough figures. And also there are various job items in each separated state of operations. Since these operations are organized in a network system as the event driven system, the analysis of the operation system is came to describe the conditions which drive the system by using measure values of the system condition. As such physical values, displacement and velocity of hydraulic cylinders and hydraulic pressure values of the cylinders are used. As the results of analysis, methods of determining the time at a bucket is in contact with the ground, over loading and the end of the excavation are presented in this paper.